[syslinux] newbie question: pxelinux.cfg/default question

[a s p a s i a]

Thank you all so much ...

so there is an underlying assumption that in the /etc/dhcpd.conf file
that the MAC-to-IP address assignment is in place ....

the gethostbyip is then performed by the boot process ... if that is
not happening, then the default which is the PXE server's IP
translated to hex takes place as I see it, and if nothing exists then
it goes down to parse until it finds the /etc/pxelinux.cfg/default
file ...

that is clearer then.

thanks again!

- a.

On Thu, Mar 13, 2008 at 6:03 PM, Knut Petter <kpolberg at olberg.name> wrote:
> Just a little note. You would usually specify the  IP in the DHCP server.
>
>  ex.
>
>  host elwood {
>         hardware ethernet 08:00:69:13:08:8b;
>         fixed-address 192.168.16.16;
>  }
>  To make it load the C0A81010 config file.
>
>  Knut Petter
>
>
>
>  Andreas Kotes wrote:
>  > Hello a.,
>  >
>  > * a s p a s i a <aspasia.sf at gmail.com> [20080314 00:24]:
>  >
>  >> I understand that during PXE boot, it goes into the pxelinux.cfg and it states:
>  >>
>  >> 1. "it will search for the config file using its own IP address in
>  >> upper case hexadecimal, e.g. 192.0.2.91 -> C000025B  (you can use the
>  >> included progam "gethostip" to compute the hexadecimal IP address for
>  >> any host.) If that file is not found, it will remove one hex digit and
>  >> try again."
>  >>
>  >> a. I'm quite confused - does that mean that the files C0000025B
>  >> through "C" SHOULD exist or not?
>  >>
>  >
>  > they MAY exist. It will try C0000025B, then, C0000025, then C000002, and
>  > so on, until one of them is found. If C is not found, it uses 'default'.
>  >
>  >
>  >> b. Are these EMPTY files?
>  >>
>  >
>  > no. these are full configuration files :)
>  >
>  >
>  >> c.  and Utlimiately it reads /pxelinux.cfg/default - which I have seen
>  >> it to work.
>  >>
>  >
>  > yes.
>  >
>  >
>  >> BUT, what if I want to have like (5) FIVE - configuration files, each
>  >> of which I want to define a unique NFSroot per host?? ... example:
>  >>
>  >> pxelinux.cfg/default1
>  >> DEFAULT vmlinuz-2.6.22-14
>  >> APPEND initrd=initrd.img-2.6.22-14
>  >> nfsroot=192.168.16.5:/export/images/00A0D1E35838 ip=dhcp
>  >>
>  >
>  > this file should be called e.g. pxelinux.cfg/C0A81010 for host
>  > 192.168.16.16 to do what you want
>  >
>  >
>  >> pxelinux.cfg/default2
>  >> DEFAULT vmlinuz-2.6.22-14
>  >> APPEND initrd=initrd.img-2.6.22-14
>  >> nfsroot=192.168.16.5:/export/images/00A0D1E357CA ip=dhcp
>  >>
>  >
>  > this file should be called e.g. pxelinux.cfg/C0A81011 for host
>  > 192.168.16.17 to do what you want
>  >
>  >
>  >> Is this possible - I tried to google and a few folks point to using
>  >> the MAC address of the booting client - i tried to place a file:
>  >> /pxelinux.cfg/00A0D1E35838
>  >> which contains the appropriate above configuration, and yet still the
>  >> boot process reads the pxelinux.cfg/default file.
>  >>
>  >
>  > it has to be the _IP address_ in hex, not the MAC address :)
>  >
>  > good luck :)
>  >
>  >    Andreas
>  >
>  >
>
>
>
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